CN214336909U - Low-profile broadband array antenna - Google Patents
Low-profile broadband array antenna Download PDFInfo
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- CN214336909U CN214336909U CN202120687016.XU CN202120687016U CN214336909U CN 214336909 U CN214336909 U CN 214336909U CN 202120687016 U CN202120687016 U CN 202120687016U CN 214336909 U CN214336909 U CN 214336909U
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Abstract
The utility model discloses a low-profile broadband array antenna, belonging to the technical field of antennas; the oscillator units are parallel double-line feed different-surface printed dipoles and are respectively printed on two surfaces of the microwave dielectric plate. The synthesis network is a broadband parallel double-line synthesis feed network based on exponential line impedance transformation. The printed dipole and the synthetic network are integrated on the same microwave dielectric plate. The periodic loading layer adopts a periodic square metal coating printed by a microwave dielectric plate, and the size of the square is less than 0.08 wavelength of the central frequency. The utility model discloses have good electric property and the characteristic of low section.
Description
Technical Field
The utility model relates to antenna technical field, in particular to low section broadband array antenna.
Background
The dipole antenna is one of the most typical forms of antennas, and particularly, the dipole antenna with a reflecting plate is widely applied to the fields of satellite communication, mobile phone communication, electronic countermeasure and the like due to the advantages of wide bandwidth, good directional performance, simple and reliable structure and the like.
The dipole antennas commonly used at present mainly have a plate-line structure dipole antenna, a cross dipole antenna and a printed dipole antenna. The dipole antenna with the plate line structure mainly comprises an antenna dipole, a plate line balun and a metal reflection bottom plate, has a simple and reliable structure and is mainly used for single-line polarization; the cross dipole antenna mainly comprises a cross dipole, a metal bottom plate and a feed cable, realizes double-linear polarization and circular polarization, and is mainly used in the base station antenna, and the oscillator can be a metal oscillator or a dielectric printed structure. The printed dipole antenna is gradually developed along with the wide use of the microwave dielectric plate, and mainly comprises a printed dipole, a strip line/microstrip line balun and a metal reflecting plate, wherein the dipole and the antenna balun are integrated on the same microwave dielectric plate.
The three antennas all need connectors or radio frequency cables as output, when the antenna is used as an array antenna unit, the antenna cannot be integrated with a synthetic network of the antenna, an external cable and a power divider need to be added to realize the synthesis, the antenna synthetic network is complex, the loss is large, the overall height of the antenna is high, and in order to solve the problem, a planar printed dipole antenna is provided. However, since the impedance of the dipole antenna is related to the distance between the metal reflective bottom plates of the antenna, the three dipole antennas are required to achieve good impedance matching characteristics within 66.7% of the relative bandwidth, and the height is usually about 0.2 of low-frequency wavelength, so that the antenna has a high profile when used as a low-frequency band, especially when used at frequencies below the L-band.
SUMMERY OF THE UTILITY MODEL
In view of the above, the present invention provides a low-profile broadband array antenna. The antenna has excellent electrical performance and low profile characteristics.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a low-profile broadband array antenna comprises a coaxial feed interface, a dielectric matching layer, a periodic loading layer and a metal floor, wherein the dielectric matching layer, the periodic loading layer and the metal floor are sequentially stacked; air layers are arranged between the medium matching layer and the periodic loading layer and between the periodic loading layer and the metal floor;
the dielectric matching layer comprises a first microwave dielectric substrate; the first microwave dielectric plate is provided with a vibrator unit which is a parallel double-line feed non-planar printed dipole; the parallel double-line feed different-plane printed dipole comprises a synthetic network, and the synthetic network is a broadband parallel double-line synthetic feed network based on exponential line impedance transformation;
the periodic loading layer comprises a second microwave medium substrate, and square metal coatings arranged in a rectangular array mode are arranged on the second microwave medium substrate;
the inner conductor and the outer conductor of the coaxial feed interface are respectively connected with the main circuit of the upper surface synthetic network or the main circuit of the lower surface synthetic network of the first microwave dielectric plate.
Furthermore, the broadband parallel double-line synthesis feed network based on the exponential line impedance transformation is a one-to-eight feed network, and the parallel double-line feed non-planar printed dipole comprises a metal patch; the projections of the feed networks on the upper surface and the lower surface of the first microwave dielectric plate are overlapped; the tail ends of the branches of the feed network are connected with metal patches, and the metal patches are positioned on one sides of the tail ends of the branches; the metal patches corresponding to the upper and lower surfaces of the first microwave dielectric plate are respectively positioned on the different sides of the tail end of the branch.
Further, the side length of the square metal coating is less than 0.08 wavelength of the center frequency.
Furthermore, the main path of the feed network on the upper surface of the first microwave dielectric plate is connected with a rectangular matching branch, and the inner conductor of the coaxial feed interface is connected with the main path of the synthetic network on the upper surface of the first microwave dielectric plate through the rectangular matching branch; the main path of the feed network on the lower surface of the first microwave dielectric plate is connected with a trapezoidal matching branch section, and the outer conductor of the coaxial feed interface is connected with the main path of the synthetic network on the lower surface of the first microwave dielectric plate through the trapezoidal matching branch section.
Furthermore, the trapezoid matching branch is located right below the rectangular matching branch.
The utility model adopts the beneficial effect that above-mentioned technical scheme produced lies in:
1. the utility model discloses a periodic loading layer reduces the height of antenna, and is disguised better.
2. The utility model discloses all establish the air bed between medium matching layer and periodic loading layer and between periodic loading layer and the metal floor for the weight of antenna is lighter.
3. The utility model discloses the height that reduces the antenna is original 50%, and the antenna section is low, and the structure is more stable.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of the present invention.
Fig. 2 is a schematic structural view of a lower surface of the first microwave dielectric plate in fig. 1.
Fig. 3 is a schematic structural view of the upper surface of the second microwave dielectric plate in fig. 1.
In the figure, 1, a first microwave dielectric plate, 2, a second microwave dielectric plate, 3, a metal floor, 4, a feed network, 5, a metal patch, 6, a rectangular matching branch, 7 and a trapezoidal matching branch.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and specific embodiments.
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without inventive labor.
A low-profile broadband array antenna comprises a coaxial feed interface, a dielectric matching layer, a periodic loading layer and a metal floor 3, wherein the dielectric matching layer, the periodic loading layer and the metal floor are sequentially stacked; air layers are arranged between the medium matching layer and the periodic loading layer and between the periodic loading layer and the metal floor;
the dielectric matching layer comprises a first microwave dielectric substrate 1; the first microwave dielectric plate is provided with a vibrator unit which is a parallel double-line feed non-planar printed dipole; the parallel double-line feed different-plane printed dipole comprises a synthetic network, and the synthetic network is a broadband parallel double-line synthetic feed network based on exponential line impedance transformation;
the periodic loading layer comprises a second microwave medium substrate 2, and square metal coatings arranged in a rectangular array mode are arranged on the second microwave medium substrate;
the inner conductor and the outer conductor of the coaxial feed interface are respectively connected with the main circuit of the upper surface synthetic network or the main circuit of the lower surface synthetic network of the first microwave dielectric plate.
Furthermore, the broadband parallel double-line synthesis feed network based on the exponential line impedance transformation is a one-to-eight feed network 4, and the parallel double-line feed non-planar printed dipole comprises a metal patch 5; the projections of the feed networks on the upper surface and the lower surface of the first microwave dielectric plate are overlapped; the tail ends of the branches of the feed network are connected with metal patches, and the metal patches are positioned on one sides of the tail ends of the branches; the metal patches corresponding to the upper and lower surfaces of the first microwave dielectric plate are respectively positioned on the different sides of the tail end of the branch.
Further, the side length of the square metal coating is less than 0.08 wavelength of the center frequency.
Furthermore, the main path of the feed network on the upper surface of the first microwave dielectric plate is connected with a rectangular matching branch 6, and the inner conductor of the coaxial feed interface is connected with the main path of the synthetic network on the upper surface of the first microwave dielectric plate through the rectangular matching branch; the main path of the feed network on the lower surface of the first microwave dielectric plate is connected with a trapezoidal matching branch 7, and the outer conductor of the coaxial feed interface is connected with the main path of the synthetic network on the lower surface of the first microwave dielectric plate through the trapezoidal matching branch.
Furthermore, the trapezoid matching branch is located right below the rectangular matching branch.
The following is a more specific example:
referring to fig. 1 to 3, the present embodiment includes a low-profile broadband array antenna of a dipole unit, a composite network, a metal floor, and a periodic loading layer. The oscillator units are parallel double-line feed different-surface printed dipoles and are respectively printed on two surfaces of the microwave dielectric plate. The synthesis network is a broadband parallel double-line synthesis feed network based on exponential line impedance transformation.
The vibrator unit, the synthesis network and the matching conversion are integrated on the same microwave dielectric plate. The periodic loading layer adopts a square metal coating printed by micro-strips, and the size of the square is less than 0.08 wavelength of the central frequency. The periodic loading layer is arranged between the metal floor and the dielectric matching layer, and the dielectric matching layer and the periodic loading layer of the antenna are fixed on the metal floor through dielectric supports 3.
In the embodiment, a low-profile broadband flat antenna with excellent electrical performance is obtained by additionally adopting a metal microstructure loading mode between a printed dipole and a metal reflection bottom plate, the voltage standing wave ratio is less than 2.0 within a 66.7% frequency bandwidth range, and the height of the antenna is 0.1 time of low-frequency wavelength.
In this embodiment, the metal patch on the upper surface of the first microwave dielectric slab of the dielectric matching layer is located on the left side of the corresponding feed network, and the metal patch on the lower surface of the first microwave dielectric slab is located on the right side of the corresponding feed network.
The utility model discloses a brief theory of operation:
the parallel double-line feed different-plane printed dipole forms directional radiation through the reflection effect of the metal floor on electromagnetic waves, the balanced feed of the printed dipole and the matching from high impedance to low impedance of an ultra-wide band are realized through a parallel double-line to micro-strip structure, the phase distribution between the dipole and the metal floor is changed by adding metal micro-structure loading between the printed dipole and a metal bottom plate, and finally the ultra-wide band panel antenna unit with low profile characteristic and excellent electrical performance is obtained.
Claims (5)
1. A low-profile broadband array antenna comprises a coaxial feed interface and is characterized by further comprising a dielectric matching layer, a periodic loading layer and a metal floor (3) which are sequentially stacked; air layers are arranged between the medium matching layer and the periodic loading layer and between the periodic loading layer and the metal floor;
the dielectric matching layer comprises a first microwave dielectric substrate (1); the first microwave dielectric plate is provided with a vibrator unit which is a parallel double-line feed non-planar printed dipole; the parallel double-line feed different-plane printed dipole comprises a synthetic network, and the synthetic network is a broadband parallel double-line synthetic feed network based on exponential line impedance transformation;
the periodic loading layer comprises a second microwave medium substrate (2), and square metal coatings arranged in a rectangular array mode are arranged on the second microwave medium substrate;
the inner conductor and the outer conductor of the coaxial feed interface are respectively connected with the main circuit of the upper surface synthetic network or the main circuit of the lower surface synthetic network of the first microwave dielectric plate.
2. A low-profile broadband array antenna according to claim 1, wherein the broadband parallel twin-wire composite feed network based on exponential line impedance transformation is an eight-in-one feed network (4), and the parallel twin-wire feed anisotropic printed dipole comprises a metal patch (5); the projections of the feed networks on the upper surface and the lower surface of the first microwave dielectric plate are overlapped; the tail ends of the branches of the feed network are connected with metal patches, and the metal patches are positioned on one sides of the tail ends of the branches; the metal patches corresponding to the upper and lower surfaces of the first microwave dielectric plate are respectively positioned on the different sides of the tail end of the branch.
3. A low-profile broadband array antenna as claimed in claim 1, wherein the side length of the square metal coating is less than 0.08 wavelengths of the center frequency.
4. The low-profile broadband array antenna according to claim 2, wherein the main path of the feeding network on the upper surface of the first microwave dielectric plate is connected with a rectangular matching branch (6), and the inner conductor of the coaxial feeding interface is connected with the main path of the synthesizing network on the upper surface of the first microwave dielectric plate through the rectangular matching branch; the main path of the feed network on the lower surface of the first microwave dielectric plate is connected with a trapezoidal matching branch (7), and the outer conductor of the coaxial feed interface is connected with the main path of the synthetic network on the lower surface of the first microwave dielectric plate through the trapezoidal matching branch.
5. The low-profile broadband array antenna of claim 4, wherein the trapezoidal matching stub is located directly below the rectangular matching stub.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120687016.XU CN214336909U (en) | 2021-04-02 | 2021-04-02 | Low-profile broadband array antenna |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120687016.XU CN214336909U (en) | 2021-04-02 | 2021-04-02 | Low-profile broadband array antenna |
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| Publication Number | Publication Date |
|---|---|
| CN214336909U true CN214336909U (en) | 2021-10-01 |
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| CN202120687016.XU Active CN214336909U (en) | 2021-04-02 | 2021-04-02 | Low-profile broadband array antenna |
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| CN (1) | CN214336909U (en) |
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2021
- 2021-04-02 CN CN202120687016.XU patent/CN214336909U/en active Active
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